Limekiln



. (No Model.)

C. D.- PAGE.

LIMEKILN.

No. 342,6 2.9 Patented May-25, 1886.

lg: I I Fig.3

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, center of the three-part arch.

UNITED STATES PATENT @EETCE.

CLARK D. PAGE, OF ROCHESTER NEW YORK.

LI'MEKILN.

2:51BCIFICAT1ON forming part of Letters Patent No. 342,629, dated May 25, 1886.

Application filed January 22, 1886. Serial No. 189,354. (No model.)

To all whom it may concern.-

Be it known that I, CLARK D. PAGE, a citizen of the United States, residing at Rochester, in the county of Monroe, in the State of New York, have invented certain Improvements in Limekilns, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to certain improvements in limekilns, which improvements are fully described and illustrated in the following specification and accompanying drawings, and the novel features thereof specified in the claims annexed to the said specification.

In the accompanying drawings, representing my improvements in limekilns, Figure 1 is a vertical section. Fig. 2 is a horizontal section on theline at m, Fig. 1. Fig. 3 is a vertical section on the line y y, Fig. 2. Fig. 4 represents the blocks forming the threepart arch, as seen from below. Fig. 5 is aplan or top view of the same. Fig. 6 is a side elevation of the key or wedge-shaped block at the Fig. 7 is a transverse section through one of the copingblocks on the line 2 .2, Fig. 2. Fig. 8 represents the center block in side elevation.

The walls A A of my improved limekiln are constructed ofmasonry in the ordinary manner, the interior of the cupola being lined with fire-brick from the bottom to the top, as indicated at O. The cupola is preferably made of a slightly-tapering form, being largest at the furnaces. D D D represent the furnaces, which are provided with grate-bars E, and are made of a tapering form, with the larger part inward, as representedin Fig. 2. The cupola is divided opposite the furnaces and for some distance below them by the three-partdivisionwalls F, so as to form in the cupola opposite the furnaces three separate chambers, each of i which communicates with one of the furnaces, while there is no communication between the chambers themselves, except above or below the division-walls. The division walls are made of sufficient strength to support the charge of lime orunburned stone in the cupola above them, as represented in Fig. 3. The division-walls also support the charge which arches over and supports itself between the walls of the cupola and the upper part of the ting the limein the cupola to settle downward into the draw-pit H. As indicated in dotted lines in Fig. 2, the openings G are formed on a iadial line -which is a continuation of the length of the division-walls, so that by introducing a poker or other suitable instrument into the opening the lime may be forced off from any part of the walls.

The division-walls are formed of three coping-blocks, I I I oftire-clay, provided at their center with a block, J, also of fire-clay, provided on its sides with three vertical recesses, which receive the inner ends of the copingbloeks I 1 1 A suitably-rounded form is given to the upper sides of the coping-blocks and the center block, J, as indicated in the drawings, and in particular in Figs. 7 and 8.

Below the coping-blocks are placed the archblocks L L L also of fire-clay, the outer ends of which are let into the walls of the cupola, as indicated at N, Fig. 3. The coping-blocks I l I are supported on the arch-blocks L L L by means of the interposed brick-work K. The three'part arch is completed by the key or wedge block 0, placed atthe center of the arch-blocks. As indicated in the drawings, Figs. 4. 5, and (5, the key 0 is provided with channels or recesses on its sides, for thereception of the inner ends of the arch-blocks L L If, all of these parts being constructed of fire-clay of the form required.

The draw-pit, the opening G. and the opening into the furnaces, and the ash-pits below the furnaces are provided with suitable doors and devices for controlling the passage of air into the kiln. Provision may also be made for introducing steam into the furnaces or into the chambers at the lower part of the cupola in any suitable or preferred manner. A water-pan in the ash-pit below the furnace may be used for this purpose.

The coping-blocks may rest directly on the ICC arehblocks, the interposed brick-work K being dispensed with, although I prefer to employ it, as I thereby secure greater depth in the chambers into which the lower-part of the cupola is divided by the division-walls.

It will be observed from an inspection of the drawings that the upper part of the division-walls F is placed nearly on a line with the top of the opening between the furnaces D D D and the chambers; The object of this arrangement is to cause the charge to remain suspended in the cupola above the furnace, so that the hot gases from the furnace may have free and unobstructed access to the lower portion thereof.

In the practical operation of my improved limekiln the cupola is first filled from the furnaces down with raw stone, and above the furnaces with alternate layers of wood and stone. The fires are then lighted in the furnaces, and the wood in the cupola is allowed to burn out. As the wood is consumed, the stone settles, being filled in at the top of the cupola, as required, until the cupola is full of heated stone. The firing is then proceeded with (if it be a new kiln, slowly, for a number of days) until the division-walls and the cupola at the furnaces have become so highly heated that the lime on drawing the raw stone or lime from the draw-pit will arch over between the threepart division-walls and the sides of the cupola and sustain the charge above, leaving the chambers and draw-pit empty. As fast as burned, the lime is drawn down into the pit at suitable intervals of time by pushing it off the division-walls by pokers inserted through the furnaces or the openings G, thereby breaking the arches of lime formed opposite the tops of the furnaces, which will, however, form again as the lime descends, thereby supporting the charge until another firing has been completed.

My improved kiln, constructed, as herein described, so as to allow free access of the furnace gases to the whole of the lower portion of the charge in the cupola, will produce nearly double. the amount of lime in the same time and with the consumption of the same 7 amount of fuel in the furnaces-that can be with which I am acthe unburned charge is supported on the three part division walls F, so as to allow the hot gases from the furnace to actdireetly and uniformly on the whole of the lower portion of the material.

Another great advantage of my improved kiln is,that the intense heat is not confined in the furnaces, but passes immediately out from them directly under the charge. thereby increasing the durability of the furnaces and the arches at their inner ends,and preventing their burning out. In all other kilns the intense heat is confined within the furnaces, its passage inward being greatly checked by the charge of stone or lime in the cupola opposite the inner ends of the furnaces, and the peculiar shape'and arrangement of my furnaces and three part division -walls is such that each furnace is independent of the others, and there is no interference or counteraction of the draft.

I claim- 1. The combination, with the cupola, of the three furnaces'D D D and the three-part division-walls F F F, extending radially across the cupola opposite the furnaces, substantially as described.

2. The combination, with the cupola, of the three-part division-walls F F F and the radial openings G in the same line with the walls, substantially as described.

3. The combination, with the cupola, of the three part division-walls F F F, consisting of the coping-blocks I I 1*, center block, J ,archblocks L L L", and key 0, substantially as described.

4. The combination, with the cupola, of the three-part division-walls F F F, consisting of the coping-blocks I I 1", center block,J, archbloeks L L L, key 0, and interposed brickwork K, substantially as described.

5. The combination, with a cupola, of a three-part division-wall having its upper portion composed of the coping-blocks I I I and center block, J, substantially as described.

6. The combination, with the cupola, of a three part division wall supported on the arch-blocks L L L, having key 0, substantially as described.

7. The combination, with the cupola, pro vided with the three-part division-walls FF F, of the three furnaces D D D, enlarged toward their inner ends, so as to permit the detachment of the lime from any part of the division-walls, substantially as and for the purposes set forth.

CLARK D. PAGE. 

